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Fix server.py, expand tasks to 40, add tests, clean observation schema

simplify tasks in openenv.yaml to match reference format

use openenv base classes and fix yaml format to match working submissions

fix openenv.yaml with spec_version, type, runtime, app, port

add grader endpoint, fix reward bounds and openenv.yaml

commit missing openenv.yaml and server.py changes

fix server entry point

Fix server entrypoint packaging and align environment docs

fix state endpoint, author, and init exports

initial submission